Checking the values of form post in PHP Codeigniter

$name = $this->input->post(' name' ) ;
$email = $this- >input->post( ' email' ) ;
$subj ect = $this->input->post( ' subject' ) ;
$message = $this->input->post( ' message' ) ;
if( empty($name) OR empty( $email) OR empty($subject) OR empty($message) )
{
  show_404 ("The form submitted left fields blank, all fields are required. Please go back and fill in all of the fields. " ) ;
}

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